本文選題：鋼筋混凝土梁 + CFRP板嵌入式加固�。� 參考：《廣西大學(xué)》2014年博士論文

【摘要】：CFRP板嵌入式加固法是一種新形式的加固方法。CFRP板嵌入式加固法是指預(yù)先在需要加固的構(gòu)件表面開槽,其次向槽中注入粘結(jié)材料,然后將CFRP板放入槽中來改善構(gòu)件受力性能的加固方法。與表面外貼法相比,CFRP板嵌入式加固法具有材料用量少、耐腐蝕、適用于表面不平的構(gòu)件,與構(gòu)件傳力更有效,遭受意外荷載不易損傷等特點(diǎn)。 本文制作了17根鋼筋根混凝土梁,試驗(yàn)梁設(shè)計(jì)時(shí)考慮了配筋率、CFRP板加固量和鋼筋混凝土梁損傷等3種試驗(yàn)參數(shù)。通過測定試驗(yàn)梁的開裂荷載、屈服荷載、極限荷載、變形、裂縫以及試驗(yàn)梁混凝土、鋼筋、碳纖維應(yīng)變,分析CFRP板條嵌入式加固鋼筋混凝土梁的破壞機(jī)理,研究配筋率、CFRP板加固量和損傷情況等對加固梁裂縫發(fā)展、開裂荷載、屈服荷載、極限荷載及剛度的影響,并對比CFRP板條嵌入式加固損傷鋼筋混凝土梁與外貼CFRP板條加固損傷鋼筋混凝土梁的加固效果。在試驗(yàn)研究的基礎(chǔ)上,對加固梁的受彎承載力、撓度計(jì)算方法和裂縫計(jì)算方法進(jìn)行理論研究。主要研究工作如下： 1、進(jìn)行CFRP板條嵌入式加固鋼筋混凝土梁的抗彎試驗(yàn)研究,分析CFRP板條嵌入式加固鋼筋混凝土梁的破壞機(jī)理,研究配筋率、CFRP板加固量和梁損傷情況等對加固破壞形式、裂縫發(fā)展、開裂荷載、屈服荷載、極限荷載及剛度的影響。 2、在現(xiàn)有CFRP加固結(jié)構(gòu)構(gòu)件的承載力計(jì)算模型的基礎(chǔ)上,根據(jù)鋼筋混凝土梁抗彎承載力計(jì)算的基本理論,探討CFRP板條嵌入式加固鋼筋混凝土梁承載力計(jì)算方法。 3、采用最小剛度原則,分析CFRP板條嵌入式加固鋼筋混凝土梁在正常使用狀態(tài)下的剛度,推導(dǎo)加固梁跨中撓度計(jì)算公式。 4、根據(jù)鋼筋混凝土梁裂縫計(jì)算理論,推導(dǎo)加固梁在正常使用狀態(tài)的平均裂縫間距和最大裂縫寬度計(jì)算公式。 通過上述的試驗(yàn)研究和理論研究,得出如下一些結(jié)論： 1、加固梁的破壞形式主要受配筋率和加固量的影響；采用CFRP板條嵌入式加固可以有效的提高加固梁的特征荷載；加固梁的變形性能主要受加固量和初始荷載影響。 2、在不考慮發(fā)生CFRP板剝離破壞的情況下,推導(dǎo)建立加固梁的承載力計(jì)算公式,計(jì)算結(jié)果與試驗(yàn)值基本吻合。 3、推導(dǎo)出的撓度計(jì)算公式計(jì)算正常使用狀態(tài)下加固梁的跨中撓度,計(jì)算值與試驗(yàn)值較吻合。 4、根據(jù)鋼筋混凝土梁裂縫計(jì)算理論,給出了正常使用狀態(tài)下加固梁的平均裂縫間距和最大裂縫寬度計(jì)算公式。通過和試驗(yàn)值比較,計(jì)算值與試驗(yàn)值相差較小。
[Abstract]:The embedded reinforcement method of CFRP plate is a new kind of reinforcement method. The embedded reinforcement method of CFRP plate refers to the slotted surface of the member that needs to be strengthened in advance, and then injects the bonding material into the groove. Then the CFRP plate is put into the slot to improve the mechanical performance of the member. Compared with the external surface sticking method, the embedded reinforcement method of CFRP plate has the characteristics of less material consumption, corrosion resistance, suitable for uneven surface members, more effective transmission of force with the members, and less damage to the unexpected loads. In this paper, 17 concrete beams with reinforced roots have been made, and three test parameters, such as reinforcement ratio and CFRP plate reinforcement and damage of reinforced concrete beams, have been considered in the design of test beams. By measuring the cracking load, yield load, ultimate load, deformation, crack and strain of concrete, steel bar and carbon fiber of test beam, the failure mechanism of reinforced concrete beam strengthened with CFRP slab embedded is analyzed. The effects of reinforcement ratio and CFRP plate strengthening amount and damage on crack development, cracking load, yield load, ultimate load and stiffness of strengthened beam are studied. The reinforcement effects of CFRP slab embedded reinforced concrete beam and external CFRP slab reinforced concrete beam are compared. On the basis of experimental study, the flexural bearing capacity, deflection calculation method and crack calculation method of strengthened beams are studied theoretically. The main work of the study is as follows: 1. The bending test of reinforced concrete beam strengthened with CFRP slab embedded is carried out, the failure mechanism of reinforced concrete beam strengthened with CFRP slab embedded is analyzed, and the failure form and crack development of reinforced concrete beam strengthened by reinforced concrete slab reinforced with CFRP slab are studied. Effect of cracking load, yield load, ultimate load and stiffness. 2. On the basis of the existing calculation model of the bearing capacity of reinforced concrete beams strengthened with CFRP, according to the basic theory of flexural bearing capacity calculation of reinforced concrete beams, the calculation method of bearing capacity of reinforced concrete beams strengthened with CFRP slab embedded is discussed. 3. By using the principle of minimum stiffness, the stiffness of reinforced concrete beams strengthened by CFRP slab embedded in normal condition is analyzed, and the calculation formula of deflection of reinforced concrete beams is deduced. 4. According to the theory of crack calculation of reinforced concrete beams, the formulas of average crack spacing and maximum crack width of reinforced concrete beams in normal service are derived. Based on the above experimental and theoretical studies, some conclusions are drawn as follows: 1. The failure form of the strengthened beam is mainly affected by the reinforcement ratio and the amount of reinforcement; the characteristic load of the strengthened beam can be effectively increased by using CFRP slab embedded reinforcement; the deformation performance of the strengthened beam is mainly affected by the reinforcement amount and initial load. 2. Without taking into account the peeling failure of CFRP plate, the formula for calculating the bearing capacity of strengthened beams is derived, and the calculated results are in good agreement with the experimental values. 3. The deflection formula is derived to calculate the mid-span deflection of the strengthened beam under normal working condition, and the calculated value is in good agreement with the experimental value. 4. According to the theory of crack calculation of reinforced concrete beams, the formulas of average crack spacing and maximum crack width of reinforced concrete beams in normal service are given. Compared with the test value, the difference between the calculated value and the test value is small.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU375.1

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本文編號：1911123